Video of Joe Biden giving a speech when Robert Byrd passed away is circulating the web. Byrd was once connected to the KKK. He wasn't a grand wizard, but he certainly had ties to the group.
As stated on USA Today's fact check:
Byrd grew up in West Virginia, which is where he got involved with the KKK.
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“Many of the ‘best’ people were members — even senators and other high officials,” he wrote in his autobiography. “It was with such background impressions, therefore, that I sought to become a member of the KKK in the early 1940s.”
He recounted in his autobiography that at that time, he wrote a letter to Joel L. Baskin, the Klan’s grand dragon in his area, asking to join. In order to start a Klan chapter, or "klavern," in his town, Byrd was tasked with recruiting 150 people to the Klan. When he involved enough people to start a klavern, a unanimous vote among the recruits named him “Exalted Cyclops” of their group, which is the highest-ranking position in a chapter.